import urllib.request
import urllib.parse
import json


# https://movie.douban.com/j/chart/top_list?type=5&interval_id=100%3A90&action=&
# start=0&limit=20

# https://movie.douban.com/j/chart/top_list?type=5&interval_id=100%3A90&action=&
# start=20&limit=20

# https://movie.douban.com/j/chart/top_list?type=5&interval_id=100%3A90&action=&
# start=40&limit=20

# https://movie.douban.com/j/chart/top_list?type=5&interval_id=100%3A90&action=&
# start=60&limit=20

# page    1  2   3   4
# start   0  20  40  60

# start （page - 1）*20


# 下载豆瓣电影前10页的数据
# （1） 请求对象的定制
# （2） 获取响应的数据
# （3） 下载数据


def create_quest(page):
    base_url = 'https://movie.douban.com/j/chart/top_list?type=5&interval_id=100%3A90&action=&'
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36'
    }
    data = {
        "start" : (page - 1) * 20,
        'limit' : 20
    }
    data = urllib.parse.urlencode(data)
    url = base_url + data
    # print(url)
    request = urllib.request.Request(url=url, headers=headers)
    return request

def get_content(request):
    response = urllib.request.urlopen(request)
    content = response.read().decode('utf-8')
    return content


def down_load(page, content):
    with open("douban_" + str(page) + ".json", "w", encoding="utf-8") as fp:
        fp.write(content)

if __name__ == '__main__':
    start_page = int(input('请输入起始的页码'))
    end_page = int(input('请输入结束的页面'))

    for page in range(start_page, end_page + 1):
        # 每一页都有自己的请求对象的定制
        request = create_quest(page)
        # 获取响应的数据
        content = get_content(request)
        # 下载
        down_load(page, content)